Introduction. 



in this short paper, fohowing the method I adopted in my 

 paper Eric'ineæ (Pirolaceæ, Ericaceae) 2. The biological 

 anatomy of the leaves and of the stems, ^ I intend pointing 

 out such characters in Diapensia lapponica as are more particularly 

 connected with the climatic factors. As this species has been very 

 exhaustively described in the literature which deals with it, there 

 have been only a few new data for me to record. 



I have had a fairly large quantity of material at my disposal 

 from West and East Greenland and from Finmark, which has en- 

 abled me to verify the different statements. 



A List of the chief Literature : — 



BoKGESEN, F., 1895: Bidrag til Kundskaben om ariitiske Planters Blad- 

 bygning. (Botanisk Tidsskrift, Ed. 19.) 

 Ct.eve, A., 1901: Zum Pflanzenleben in Nordschwedischen Hochgebirgen. 



(Bihang till kgl. sv. Vet. Ak. Handl., Bd. 36, Afd. III, 15, Stockholm.) 

 Grevel, W., 1897: Anatomische Untersuchungen über die Familie der Dia- 



pensiaceae. (Bot. Centralblatt, Bd. 69.) 

 Hesselman, H., 1900: Om Mykoirhizabildningar hos aiktiska växter. (Bihang 



tili kgl. SV. Vet. Ak. Handl., Bd. 26, Afd. Ill, 2, Stockholm.) 

 LiNDMAN, C. A. M., 1887: Bidrag till kännedomen om skandinaviska fjäll- 



växternas Blomning och Befruktning. (Bihang tili kgl. sv. Vet. Akad. 



Handl., Bd. 12, Afd. III, 6, Stockholm.) 

 Sernandek, H., 1901 : Den skandinaviska vegetationens spridningsbioiogi. 



Upsala. 

 Skottsdekc, с 1900: Einige bliitenbiologische Beobachtungen in arkt. Teile 



vom schwedisch Lappland. (Med. från Stockholms Högskola, Nr. 210, 



Stockholm.) 

 Sylvéx, N., 1906: Om de svenska Dikotyledonernas första Förstärknings- 



stadium. (Kungl. sv. Vetensk. Akad. Handl., Bd. 40.) 

 Tedix, H., 1892: Bidrag till kännedomen om primäre barken hos vedaitede 

 . dikotyler. Lund. 



^ The structure and Biology of the Arctic Flowering Plants, 1, Meddelelser 

 om Grönland, Vol. XXXVI, 1908, p. 75. 



